International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 08 Issue: 04 | Apr 2021
p-ISSN: 2395-0072
www.irjet.net
An Experimental Investigation on the Effect of Nano- Silica Particles on the Properties of Concrete Mohammed Ayub Ghori1, Syed Ahmed Uddin Fahad2, Mohammad Zeeshan3, Mr. K Sri Charan 1, 2, 3B.E
Students, Dept. of Civil Engineering, ISL Engineering College, Hyderabad Professor, Dept. of Civil Engineering, ISL Engineering College, Hyderabad ---------------------------------------------------------------------***---------------------------------------------------------------------4Assistant
Abstract - Concrete is the one of the powerful ingredient
been always a relationship between the microstructure and bulk properties and researchers are making efforts to establish this relationship in concrete. The contemporary building sector is working for the development of advanced and new cementitious materials. Performance enhancement of cementitious system consists of judicious utilization of materials, developing more durable and sustainable concrete to reduce the maintenance and life cycle cost. There are two approaches for the performance enhancement of cement based materials, one is to find out suitable alternative materials to replace cementitious materials such as Geopolymer and another approach is tuning the performance of cement by admixtures. Nanotechnology is an emerging avenue of research having a potential impact on every domain of science and technology [3]. There are number of definitions for nanotechnology given by many researchers. Drexler et al. [4] defined as ‘‘the control of the structure of matter based on molecule-by-molecule control of products and byproducts’’. Some researchers defined as ‘‘the understanding, control and manufacturing of matter on the order of nanometers (lesser than 100 nm) to create materials with fundamentally new properties and functions [5]. For construction sector, nanotechnology can be defined as science of controlling the properties at nanometer scale which can make revolutionary changes in bulk material properties. The aim of the application of ultra-fine additives like nanosilica in cementitious systems is to improve the characteristics of the plastic and hardened material. Micro and nano-scaled silica particles have a filler effect by filling up the voids between the cement grains. With the right composition, the higher packing density results in a lower water demand of the mixture and it also contributes to strength enhancement due to the reduced capillary porosity. Beside this physical effect as obtained by addition, nanosilica has a pozzolanic reactivity which is much higher compared to silica fume. Thus, both the effects are very important in developing ultra-high performance concrete [6–8] (Fig. 1). There may be two possible reaction mechanisms during hydration of cement in presence of nanosilica. Hydration of cement can be accelerated by addition of nanosilica. When nanosilica is added to cement grains, H2SiO2 4 forms and reacts with the available Ca2+ which forms an additional calcium– silicate–hydrate (C–S–H) and these C–S–H particles are spread in the water between the cement particles and serve as seeds for the formation of more compact C– S–H phase. The formation of the C–S–H phase is no longer
for construction field, this concrete can improved by adding some extra additives like nano powders which helps to increases the strength in the concrete, but nano powder of silica is very advantageous in reducing temperature effects and high hardness property, so it used in highly temperature condition as a coatings and paints, the requirement of journals by using nano silica powder in concrete is minimum. Improving concrete properties by addition of Nano particles have shown significant improvement than conventional concrete. Adding Nano materials in ordinary concrete can improve the performance of concrete including strength, toughness, durability, permeability, fire resistance and other properties. The application of Nano silica in concrete not only save the resources and energy but also protect the environment from the pollution with the reduction of waste material and reduction of CO2 emission. The influence of Nano-silica on various properties of concrete is obtained by replacing the cement with various percentages of Nano silica. In this present work nano silica used as a partial replacement for cement in the range of 0.5%, 1%, 1.5%, 2% weight of cement for M30 mix. Concrete cubes and cylinders have been casted. Laboratory tests are conducted to determine the Compressive Strength, Split Tensile Strength of Nano-silica concrete at the age of 7 and 28 days. Key Words: Strength, Nano Technology, Nano-Silica Powder, Nano Silica Concrete, Compressive Strength, Split Tensile Strength.
1. INTRODUCTION Concrete remains the choice of engineers in construction materials owing to its remarkable features like moldability to various shapes, easily available ingredients, high strength and low cost in spite of its environmental concern. Approximately 20 billion metric ton of concrete is being produced every year [1]. The production of cement for concrete is contributing nearly 8% of global carbon dioxide emission [2] and thus, a matter of concern for environmentalist. It is a composite material with wide range of length scales from millimeter to nanometer. Usually concrete is taken as one material by considering its bulk strength and other engineering properties, but at micro and nanoscale, it is having different type of compositions with complex characteristics. There has © 2021, IRJET
|
Impact Factor value: 7.529
|
ISO 9001:2008 Certified Journal
|
Page 1385